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- /*
- LUFA Library
- Copyright (C) Dean Camera, 2014.
-
- dean [at] fourwalledcubicle [dot] com
- www.lufa-lib.org
- */
-
- /*
- Copyright 2014 Dean Camera (dean [at] fourwalledcubicle [dot] com)
-
- Permission to use, copy, modify, distribute, and sell this
- software and its documentation for any purpose is hereby granted
- without fee, provided that the above copyright notice appear in
- all copies and that both that the copyright notice and this
- permission notice and warranty disclaimer appear in supporting
- documentation, and that the name of the author not be used in
- advertising or publicity pertaining to distribution of the
- software without specific, written prior permission.
-
- The author disclaims all warranties with regard to this
- software, including all implied warranties of merchantability
- and fitness. In no event shall the author be liable for any
- special, indirect or consequential damages or any damages
- whatsoever resulting from loss of use, data or profits, whether
- in an action of contract, negligence or other tortious action,
- arising out of or in connection with the use or performance of
- this software.
- */
-
- /** \file
- *
- * Main source file for the VirtualSerial demo. This file contains the main tasks of the demo and
- * is responsible for the initial application hardware configuration.
- */
-
- #include "VirtualSerial.h"
-
- /** Contains the current baud rate and other settings of the virtual serial port. While this demo does not use
- * the physical USART and thus does not use these settings, they must still be retained and returned to the host
- * upon request or the host will assume the device is non-functional.
- *
- * These values are set by the host via a class-specific request, however they are not required to be used accurately.
- * It is possible to completely ignore these value or use other settings as the host is completely unaware of the physical
- * serial link characteristics and instead sends and receives data in endpoint streams.
- */
- static CDC_LineEncoding_t LineEncoding = { .BaudRateBPS = 0,
- .CharFormat = CDC_LINEENCODING_OneStopBit,
- .ParityType = CDC_PARITY_None,
- .DataBits = 8 };
-
-
- /** Main program entry point. This routine contains the overall program flow, including initial
- * setup of all components and the main program loop.
- */
- int main(void)
- {
- SetupHardware();
-
- LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
- GlobalInterruptEnable();
-
- for (;;)
- {
- CDC_Task();
- USB_USBTask();
- }
- }
-
- /** Configures the board hardware and chip peripherals for the demo's functionality. */
- void SetupHardware(void)
- {
- #if (ARCH == ARCH_AVR8)
- /* Disable watchdog if enabled by bootloader/fuses */
- MCUSR &= ~(1 << WDRF);
- wdt_disable();
-
- /* Disable clock division */
- clock_prescale_set(clock_div_1);
- #elif (ARCH == ARCH_XMEGA)
- /* Start the PLL to multiply the 2MHz RC oscillator to 32MHz and switch the CPU core to run from it */
- XMEGACLK_StartPLL(CLOCK_SRC_INT_RC2MHZ, 2000000, F_CPU);
- XMEGACLK_SetCPUClockSource(CLOCK_SRC_PLL);
-
- /* Start the 32MHz internal RC oscillator and start the DFLL to increase it to 48MHz using the USB SOF as a reference */
- XMEGACLK_StartInternalOscillator(CLOCK_SRC_INT_RC32MHZ);
- XMEGACLK_StartDFLL(CLOCK_SRC_INT_RC32MHZ, DFLL_REF_INT_USBSOF, F_USB);
-
- PMIC.CTRL = PMIC_LOLVLEN_bm | PMIC_MEDLVLEN_bm | PMIC_HILVLEN_bm;
- #endif
-
- /* Hardware Initialization */
- Joystick_Init();
- LEDs_Init();
- USB_Init();
- }
-
- /** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs and
- * starts the library USB task to begin the enumeration and USB management process.
- */
- void EVENT_USB_Device_Connect(void)
- {
- /* Indicate USB enumerating */
- LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
- }
-
- /** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
- * the status LEDs and stops the USB management and CDC management tasks.
- */
- void EVENT_USB_Device_Disconnect(void)
- {
- /* Indicate USB not ready */
- LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
- }
-
- /** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration
- * of the USB device after enumeration - the device endpoints are configured and the CDC management task started.
- */
- void EVENT_USB_Device_ConfigurationChanged(void)
- {
- bool ConfigSuccess = true;
-
- /* Setup CDC Data Endpoints */
- ConfigSuccess &= Endpoint_ConfigureEndpoint(CDC_NOTIFICATION_EPADDR, EP_TYPE_INTERRUPT, CDC_NOTIFICATION_EPSIZE, 1);
- ConfigSuccess &= Endpoint_ConfigureEndpoint(CDC_TX_EPADDR, EP_TYPE_BULK, CDC_TXRX_EPSIZE, 1);
- ConfigSuccess &= Endpoint_ConfigureEndpoint(CDC_RX_EPADDR, EP_TYPE_BULK, CDC_TXRX_EPSIZE, 1);
-
- /* Reset line encoding baud rate so that the host knows to send new values */
- LineEncoding.BaudRateBPS = 0;
-
- /* Indicate endpoint configuration success or failure */
- LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);
- }
-
- /** Event handler for the USB_ControlRequest event. This is used to catch and process control requests sent to
- * the device from the USB host before passing along unhandled control requests to the library for processing
- * internally.
- */
- void EVENT_USB_Device_ControlRequest(void)
- {
- /* Process CDC specific control requests */
- switch (USB_ControlRequest.bRequest)
- {
- case CDC_REQ_GetLineEncoding:
- if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
- {
- Endpoint_ClearSETUP();
-
- /* Write the line coding data to the control endpoint */
- Endpoint_Write_Control_Stream_LE(&LineEncoding, sizeof(CDC_LineEncoding_t));
- Endpoint_ClearOUT();
- }
-
- break;
- case CDC_REQ_SetLineEncoding:
- if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
- {
- Endpoint_ClearSETUP();
-
- /* Read the line coding data in from the host into the global struct */
- Endpoint_Read_Control_Stream_LE(&LineEncoding, sizeof(CDC_LineEncoding_t));
- Endpoint_ClearIN();
- }
-
- break;
- case CDC_REQ_SetControlLineState:
- if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
- {
- Endpoint_ClearSETUP();
- Endpoint_ClearStatusStage();
-
- /* NOTE: Here you can read in the line state mask from the host, to get the current state of the output handshake
- lines. The mask is read in from the wValue parameter in USB_ControlRequest, and can be masked against the
- CONTROL_LINE_OUT_* masks to determine the RTS and DTR line states using the following code:
- */
- }
-
- break;
- }
- }
-
- /** Function to manage CDC data transmission and reception to and from the host. */
- void CDC_Task(void)
- {
- char* ReportString = NULL;
- uint8_t JoyStatus_LCL = Joystick_GetStatus();
- static bool ActionSent = false;
-
- /* Device must be connected and configured for the task to run */
- if (USB_DeviceState != DEVICE_STATE_Configured)
- return;
-
- /* Determine if a joystick action has occurred */
- if (JoyStatus_LCL & JOY_UP)
- ReportString = "Joystick Up\r\n";
- else if (JoyStatus_LCL & JOY_DOWN)
- ReportString = "Joystick Down\r\n";
- else if (JoyStatus_LCL & JOY_LEFT)
- ReportString = "Joystick Left\r\n";
- else if (JoyStatus_LCL & JOY_RIGHT)
- ReportString = "Joystick Right\r\n";
- else if (JoyStatus_LCL & JOY_PRESS)
- ReportString = "Joystick Pressed\r\n";
- else
- ActionSent = false;
-
- /* Flag management - Only allow one string to be sent per action */
- if ((ReportString != NULL) && (ActionSent == false) && LineEncoding.BaudRateBPS)
- {
- ActionSent = true;
-
- /* Select the Serial Tx Endpoint */
- Endpoint_SelectEndpoint(CDC_TX_EPADDR);
-
- /* Write the String to the Endpoint */
- Endpoint_Write_Stream_LE(ReportString, strlen(ReportString), NULL);
-
- /* Remember if the packet to send completely fills the endpoint */
- bool IsFull = (Endpoint_BytesInEndpoint() == CDC_TXRX_EPSIZE);
-
- /* Finalize the stream transfer to send the last packet */
- Endpoint_ClearIN();
-
- /* If the last packet filled the endpoint, send an empty packet to release the buffer on
- * the receiver (otherwise all data will be cached until a non-full packet is received) */
- if (IsFull)
- {
- /* Wait until the endpoint is ready for another packet */
- Endpoint_WaitUntilReady();
-
- /* Send an empty packet to ensure that the host does not buffer data sent to it */
- Endpoint_ClearIN();
- }
- }
-
- /* Select the Serial Rx Endpoint */
- Endpoint_SelectEndpoint(CDC_RX_EPADDR);
-
- /* Throw away any received data from the host */
- if (Endpoint_IsOUTReceived())
- Endpoint_ClearOUT();
- }
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